Using trainers, and a map editor I build ramps in the Los Angeles River area and around Beverly Hills. In the first part I build ramps in a down hill part of Beverly Hills. Shoot at the cars as they approach which they then panic and speed up over the ramps. They go flying!
In the second part I use a speed multiplier to get up to 100+ for the jump and as shown in the profile image I almost hit a police helicopter. I added some proximity mines to the van and added some extra boom on impact.